Bump libcompose and sync dependencies

vendor/github.com/docker/containerd/supervisor/signal.go

@@ -1,27 +0,0 @@
-package supervisor
-
-import "os"
-
-type SignalTask struct {
-	baseTask
-	ID     string
-	PID    string
-	Signal os.Signal
-}
-
-func (s *Supervisor) signal(t *SignalTask) error {
-	i, ok := s.containers[t.ID]
-	if !ok {
-		return ErrContainerNotFound
-	}
-	processes, err := i.container.Processes()
-	if err != nil {
-		return err
-	}
-	for _, p := range processes {
-		if p.ID() == t.PID {
-			return p.Signal(t.Signal)
-		}
-	}
-	return ErrProcessNotFound
-}